# Homework Help: Phase difference

1. May 28, 2014

### kelvin macks

1. The problem statement, all variables and given/known data

for part ii , why the phase difference isnt =pi/2 ? i'm having problem uploading the photo .https://www.flickr.com/photos/123101228@N03/14289633415/

2. Relevant equations

3. The attempt at a solution

2. May 28, 2014

### haruspex

In the second graph under ii, you appear to have pencilled in two arrows exactly one complete cycle apart. How far is that in terms of radians?

3. May 28, 2014

### kelvin macks

i am not sure the penciled arrows is correct or not? on the top diagram in ii, both arrow at 0 and pi pointed downwards, whereas the below diagram pionted upwards. i did this beacuse i refer to the notes on other old book , but i dont know the reason why should i do this. can you expalin why?

4. May 28, 2014

### kelvin macks

...deleted

Last edited: May 28, 2014
5. May 28, 2014

### haruspex

I wasn't asking why the arrows are there, that doesn't matter. I'm just asking how far apart you think they are as a number of radians, i.e. their phase difference. From your reply, you seem to think they're π apart. They're one complete cycle apart, which is 2π.

6. May 28, 2014

### kelvin macks

sorry , i should nt have asked this question. i realized my mistake.